Search Publications
The Early Data Release of the Dark Energy Spectroscopic Instrument
Alexander, D. M.; Juneau, S.; Kim, S. +267 more
The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This paper describes the public release of those spectra, the catalogs of derived properties, and the intermediate data…
Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at z = 4–8 from CEERS
Papovich, Casey; Cole, Justin W.; Yang, Guang +36 more
We analyze the evolution of massive (log10[M ⋆/M ⊙] > 10) galaxies at z ∼ 1–4 selected from JWST Cosmic Evolution Early Release Survey (CEERS). We infer the physical properties of all galaxies in the CEERS NIRCam imaging through spectral energy distribution (SED) fitting with dense basis to select a sample of hi…
JWST/NIRCam Transmission Spectroscopy of the Nearby Sub-Earth GJ 341b
Sing, David K.; Lustig-Yaeger, Jacob; Fu, Guangwei +17 more
We present a JWST/Near Infrared Camera (NIRCam) transmission spectrum from 3.9 to 5.0 µm of the recently validated sub-Earth GJ 341b (R P = 0.92 R ⊕, T eq = 540 K) orbiting a nearby bright M1 star (d = 10.4 pc, K mag = 5.6). We use three independent pipelines to reduce the data from the three JWST …
A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor
Brogi, Matteo; Kempton, Eliza; Line, Michael R. +12 more
Ground-based high-resolution and space-based low-resolution spectroscopy are the two main avenues through which transiting exoplanet atmospheres are studied. Both methods provide unique strengths and shortcomings, and combining the two can be a powerful probe into an exoplanet's atmosphere. Within a joint atmospheric retrieval framework, we combin…
JWST COMPASS: A NIRSpec/G395H Transmission Spectrum of the Sub-Neptune TOI-836c
Batalha, Natalie M.; Moran, Sarah E.; Kirk, James +13 more
Planets between the sizes of Earth and Neptune are the most common in the Galaxy, bridging the gap between the terrestrial and giant planets in our solar system. Now that we are firmly in the era of JWST, we can begin to measure, in more detail, the atmospheres of these ubiquitous planets to better understand their evolutionary trajectories. The t…
JWST-TST High Contrast: Achieving Direct Spectroscopy of Faint Substellar Companions Next to Bright Stars with the NIRSpec Integral Field Unit
Anderson, Jay; Wakeford, Hannah R.; van der Marel, Roeland P. +33 more
The JWST NIRSpec integral field unit (IFU) presents a unique opportunity to observe directly imaged exoplanets from 3 to 5 µm at moderate spectral resolution (R ∼ 2700) and thereby better constrain the composition, disequilibrium chemistry, and cloud properties of their atmospheres. In this work, we present the first NIRSpec IFU high-contras…
The APO-K2 Catalog. I. 7500 Red Giants with Fundamental Stellar Parameters from APOGEE DR17 Spectroscopy and K2-GAP Asteroseismology
Pinsonneault, Marc; Stassun, Keivan G.; García, Rafael A. +14 more
We present a catalog of fundamental stellar properties for ~7500 evolved stars, including stellar radii and masses, determined from the combination of spectroscopic observations from the Apache Point Observatory Galactic Evolution Experiment, part of the Sloan Digital Sky Survey IV, and asteroseismology from K2. The resulting APO-K2 catalog provid…
A Large and Variable Leading Tail of Helium in a Hot Saturn Undergoing Runaway Inflation
Vanderburg, Andrew; Cochran, William D.; Mahadevan, Suvrath +14 more
Atmospheric escape shapes the fate of exoplanets, with statistical evidence for transformative mass loss imprinted across the mass–radius–insolation distribution. Here, we present transit spectroscopy of the highly irradiated, low-gravity, inflated hot Saturn HAT-P-67 b. The Habitable Zone Planet Finder spectra show a detection of up to 10% absorp…
JWST Imaging of Edge-on Protoplanetary Disks. I. Fully Vertically Mixed 10 µm Grains in the Outer Regions of a 1000 au Disk
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
Scattered light imaging of protoplanetary disks provides key insights on the geometry and dust properties in the disk surface. Here, we present James Webb Space Telescope (JWST) 2–21 µm images of a 1000 au radius edge-on protoplanetary disk surrounding an 0.4 M ⊙ young star in Taurus, Two Micron All Sky Survey (2MASS) J04202144 + …
JWST-TST High Contrast: Asymmetries, Dust Populations, and Hints of a Collision in the β Pictoris Disk with NIRCam and MIRI
Stark, Christopher C.; Valenti, Jeff A.; van der Marel, Roeland P. +21 more
We present the first JWST Mid-Infrared Instrument (MIRI) and Near Infrared Camera (NIRCam) observations of the prominent debris disk around β Pictoris. Coronagraphic observations in eight filters spanning from 1.8 to 23 µm provide an unprecedentedly clear view of the disk at these wavelengths. The objectives of the observing program were to …